Instruments Definition and 100 Threads

Homework Statement 1. Peter cannot see distinctly objects closer than 40 cm from the eye. Find the power of lens that enable him to see objects at distinct vision 2. A man has near point of 50 cm and a far point of 200 cm. a. What kind of glass should he used to see normally? b. What are...

Hi everyone, I'm working on a presentation for a physics class, and I've run into some difficulty. Our group is trying to explain why the bells on brass instruments allow more efficient energy transfer into the environment. I've tried a number of sources, including the book by Barry Parker...

Is the sound of one note generated by a musical instrument an example of a single sound wave or a group of in-phase (coherent) sound waves?

Homework Statement A 3.1 cm--tall object is 26 cm to the left of a lens with a focal length of 13 cm. A second lens with a focal length of 8.0 cm is 42 cm to the right of the first lens. Homework Equations 1/s + 1/s' =1/f M=-s'/s and I'll have to multiply the two M's together to get the...

Homework Statement (4 marks) Instruments that measure the force of the Earth's gravity with great accuracy are carried in airplanes over mineral-bearing landscapes. Explain how readings on the instruments indicate when there is a deposit of minerals or oil below the plane. Homework...

Why does a longer, or thicker string produce a lower note when plucked? What is it about the larger spring that causes a lesser energy output? My common intuition says that a larger spring is harder to move and therefore will vibrate with lesser frequency, but I am not satisfied with that reason.

Homework Statement Okay. So I'm sort of confused about the concept of determining whether an instrument is closed-closed, open-open, or closed-open.ie. a flute, guitar, sax, oboe, clarinet. For example, is a clarinet a closed-open instrument because your mouth covers the entire mouth piece and...

Homework Statement Why do different instruments produce different relative amplitudes and number of overtones? Homework Equations N/A The Attempt at a Solution I know that formants affect the relative amplitude of some of the harmonics, but besides that, I do not know. Any guidance or...

Here's the problem. Having traveled 15000km to my new college, I've come to realize that I cannot find the beautiful, extra fine tip, navy blue gel ink that I've used for 11 years. Now I'm desperately for a new pen, one that can give me the same, smooth, effortless feel with minimal smudge...

Hello all, I am trying to program a GPIB instrument (voltmeter and oscilloscope) in labview. I already have all the drivers set up, but I am having trouble finding easy to understand documentation on how to program these instruments. Does you know of any? Right now I am stuck on trying to...

i was pondering why no fish have ever become famous musicians :confused: when it occurred to me … are there any musical instruments designed to be played underwater?

Homework Statement Hi, I'm currently doing a project on the physics of music, more specifically physics of stringed instruments. I don't really understand how are standing waves generated and used in stringed instruments. Are the standing waves present in the string, in the sound wave, or...

Homework Statement A trumpet is essentially an open air column. Assuming that it is tuned inside a warm building. When it is taken outside for a parade on a cold day, what will happen to the sound from the instrument? Homework Equations The Attempt at a Solution -so outside the...

Homework Statement what would the generator, resonator and radiator be for a trumpet, clarinet and piano? Homework Equations --- The Attempt at a Solution A generator initiates a vibration, a resonator vibrates at the resonant frequency, and a radiator projects the vibrations into...

Homework Statement The physics of wind instruments is based on the concept of standing waves. When the player blows into the mouthpiece, the column of air inside the instrument vibrates, and standing waves are produced. Although the acoustics of wind instruments is complicated, a simple...

Homework Statement A certain dog whistle operates at 21.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 5000 Hz occurs when they are played simultaneously, estimate the...

Homework Statement In the 7 diagrams below, the solid arrow represents the object and the dashed arrow the image. The rectangle shows the position of an SINGLE OPTICAL ELEMENT. Match each diagram with the appropriate optical element. 1)http://img190.imageshack.us/img190/5176/92585723.gif...

Homework Statement part1: In the Figure below a lens of focal length 8 cm is placed between a plane mirror and a pin hole. The other side of the pin hole is illuminated by a light source (not shown), so that the light passes through the hole and is then collected by the lens. If the pin hole...

1. A diverging lens with a focal length of -14 cm is placed 12 cm to the right of a converging lens with a focal length of 18 cm. An object is placed 33cm to the left of the converging lens. Where will the final image be located. 2. 1/f = 1/di + 1/do dob = L - dia 3. After solve...

Homework Statement How does the frequency and wavelength alter between the same note played on an oboe and violin. And also what physical difference in the waves allows them to be played loudly or softly. Homework Equations The Attempt at a Solution For the oboe and violin part...

I've been wrestling with this problem for a while, and I really cannot understand it. As I understand it, the limit of the resolving power of the eye is related to diffraction: when Rayleigh's criterion is just satisfied, then two objects which are close together can just be resolved, i.e. we...

Homework Statement The "A" on a trumpet and a clarinet have the same pitch, but the two are clearly distinguishable. Which property is most important in enabling one to distinguish between these two instruments? A) intensity B) fundamental frequency C) displacement amplitude D)...

what are transfer instruments and what is the principle of operation thanks

Homework Statement An object is placed at 30 cm in front of a diverging lens with a focal length of 10 cm. What is the image distance? Homework Equations 1/f = 1/do + 1/di The Attempt at a Solution I thought this was a straight-forward question: 1/di = 1/-f - 1/do 1/di =...

I am quite confused how a speaker can produce two or more different frequencies at the same time ? Let's consider one instrument to be the thud of the kick drum Let the second instrument be a Shakuhachi flute. (From Enigma Sadeness) Let us have only one speaker( like in most of the...

Are two slapstick clowns playing a couple of dozen different music instruments Here is compilation throughout their career [url]n_r0LV4ePq4[/youtube] Is this your kind of humor?

Hi everyone, Are there any such forums for Texas Instruments such as (TI-83 Plus Silver) calculator forums? Do they have direct main forums?

Hi everybody, I have a very simple question for programmers and automation professionals, My friend told me that I can use the program National Instruments LabView as an Oscilloscope through the serial cable! Is this true? and what are the limits of this advantage? I'm using this...

What can be defined as a proper calibration process for such an instrument?

The physics of sound have been explained by many people but the relationship of practical applications are a blur. I am a brass instrument player and designer of bras instruments the relationship between bore size, taper and length are very crucial and way over most peoples head. so here is...

My question is regarding musical instruments. Their are waves produced in wind instruments and in stringed instruments. If a wind instrument (lets say a tuba) is played directly next to a stringed instrument (lets say a guitar) will the sounds waves (in air) produced by the wind instrument...

Is a pipette used to transport the aqeous reactant to the flask. Is a burette used to transport the titrant in the flask. So a pipette is smaller than a burette? What other differences between the two. Is flask, pipette and burette the key instruments in titration?

It was difficult deciding where to put this -- so feel free to move this post if you'd like! I am working on calibrating some Omega pressure transducers, and I just want some verification on my overall error. Model -- PX303 various pressures. Zero Balance -- with 0 PSI (gage pressure) on...

would it be more accurate to say that Resonance is Essential for musical instruments or Desirable.

It woud be very nice if someone could explain me how to use this calculator in matrix analyse,such as inverse ,transp,adj etc.

Does anyone know where I might find a rough guide of how difficult it is to learn different musical intruments? I guess I'm specifically interested in the fiddle. I know music theory, I can read music (at least, if given indefinite time) and even mangled a trumpet in high school, but have...

Where does the sound difference between acoustic and their electric counterparts come from, even when playing the same sustained note (i.e., same frequency)?

Hey, Can anyone explain to me how the "old fashioned" dew point hygrometer works? http://img85.imageshack.us/img85/6889/dscf03724mz14va.th.jpg And can anyone identify this instrument and explain to me how it functions? All I know that one of it's components is freon gas...

Do Physicist's consider themselve's as being one of the instruments in an experiment? Or, as, at least as one of the conditions effecting the outcome? Are these conditions included in the final report? I notice in some of the quantum physics experiments I've read there is a lot of care taken...

I have tried to solve these problems all day, but to no avail. I am very confused! 8. The instruments attached to a weather balloon have a mass of 5.0 kg. The balloon is released and exerts an upward force of 95N on the instruments. A. What is the acceleration of the balloon and...

I would like a way to be able to observe the air flow through wind instruments. I was thinking a lab where the do tests on the aerodynamics of cars. any other ideas. also does anyone know of a facility in the New York area that might be capable of such a technique. I would like to video...

Hi all, Can anybody help me on HVs, high voltages up to 60Kv? Actually I've got this HV supply , then i came across with an old ammeter in my garage which i thought could help in showing me the exact voltage my supply is transferring but i have a poblem in matching the resistances. actually i...

I've used the searchy option to check whether these kind of threads already exist or not, and although i have found similar stuff..it is not directly related to what I am going to say now. Anyway, what instruments do you people play in the physics forums? (that is if they do play...

does anyone know of any websites or books relating to the physics of musical instruments (particularly brass instruments)? i have a book by moravcsik called musical sound, but it is pretty elementary and non-mathematical. if anyone is aware of any threads already posted here on this topic...

a flute is cylindrical and when you hit the 2nd register (higher notes) the fingering is pretty much the same as on the base register. in other words, the jump is a regular octave. a clarinet is conical and the jump to the 2nd register is a 12 note jump from what i understand. can anyone...

does anyone know how to make a very efficient heat engine using casual laboratory instruments...thanks

Hello! Um...can anyone help me with this question? A woman can see clearly with her right eye only when objects are between 40.0 cm and 177 cm away. Prescription bifocals should have what power (in Diopter) so that she can see distant objects clearly (upper part)? Assume that the glasses will...

I am looking for a method of actuating a valve on a musical instrument. This particular valve needs to rotate 90 degrees, but on some instruments, 120 degrees. I will like to actuate via wire control i.e. with a embedded computer. For example, close a switch, the valve rotates 90 degrees and...

January of 2002 I started taking lessons. I play using the new Casio WK 3000. Really a professional board, fabulous sounds. I read music quite well. Just do it as a hobby from 1 to 3 hours per day. What about you all? Oh yes, I play all types of music. I especially like Elton John "I...

Whats up? I have a question, please? What is the closest distance at which an eye can see objects clearly? My answer is the near point, is that right? Thanks! Dx :wink: